$0.02
In other words, can the TM751 "capture" the DS10A RF signal, and then trigger a PLC in the power line (and use this to trigger a macro in AHP)
Gringler: From your post, it appears you already have AHP. One might infer that you're having a range issue if you want the TM751 to "relay" the signal to AHP. As Dave said, if you don't already have a CM15A, spend the $50 and get the whole thing (AHP, 4 Plug-In's, and a CM15A) If you have all that and range IS the problem, you can either do one of the CM15A range mods (I like the "F" Connector one), or you can get a SR731 "Smart" Repeater (under $50) that does re-transmit all of the X10 RF.
Or, you can get one of WGL Designs V572RF32's ($114) Whole-House Transceivers which will receive the RF from the security sensors and convert those signals to any of the 256 PLC's you desire. Those PLCs can be picked up directly by a module, or by the CM15A and a macro in AHP.
I have all of the above and highly recommend the V572RF32 - it's range covers my whole property.